Antenna system



J. O. MAUBORGNE ET ,AL

Maul-1'24, 1925. 1,530,684

ANTENNA SYSTEM Filed June 1-921 70 Radio Wansmiffer or Radio Receiver To Radio mum/H r or Rad/'0. Receiver WWi- M Patented Mar. 24, i925.

arise UNITED- s'rarssfrarenr cert-ca,

OSEPH O. MAUBORGNF: AND GUY HILL, OF WASHINGTON, DISTRICT OF CQIRTM'RIA.

an'rnmm srs'mnr.

Application filed June 29, 1921. Serial No. 481,33s.

To all .wlzom it may cmwem. Be it 'known that we, Josnrn and GUY HILL, citizens of the United States, and residents, respectively, of lVashington, in the District of Columbia, have invented ccrtain newand useful Improvements in Antenna Systems, of which the following is a specification. i

This invention relates to the art ofradio signaling, and particularly to an antenna system for transmitting andreceiving radio signals. The object of the present invention is to provide a new form of antenna consisting of a flat spiral wave coil, being in contradistinc tion to our pending United States applications bearing Serial Nun'rbers 383726), filed May 4 16,1920, 445880 filed Feb. 1'7, 1-921, "and a recently filed application, Ser. No.\459,530, filed April 8, 1921, wherein we have employed a resonance ivave coil consisting of a helix; the flat; spiral Wave coil'being of particular advanta e where installation conditions are such that a .flat coil could be installed to better advantage than one of helical form. I

In our "pending applications referred to above, we haveidescrihed' methods for recciving and transmitting radio signals in which resonance \vavc coils of helical form are introducedasa new type of antenna,

utilizing the wave development eifects produced "by electrical excitation of such antenna, either from a distant source in the form of electro-magnetio \vaves acting upon it, in which case the Wave coil serves as a receiving antenna, or the wave coil may be used as a: transmitting antenna by setting up electrical oscillations in the coil from a local source, which may have a period of its own, in which case the coil is adjusted to be'in resonance with the frequency of the oscillations of said source, or the period of the oscillations may be determined solely or mainly byrthe electrical constants of the coil, Where the local source has no period of its own.

The present invention utilizes the same general idea except that in place of a wave coil in theform of a helix, as described in all of our previous applications referred to, we make use of a wave coil in the form of a Hat spiral. .rThis is the fiat spiral resonance wave coil which we will herein- O. Mnunonerrn 24,1920, 389450, June after term, for the purpose oi convenience, spiral Wavecoil.

The spiral Wave coil 'iorining this in vention preferably consists of a length of suitably insulated conduct-in material wound in the form of a flat ral of suit able, size or dimensions such. conditions or preference may'dicta'te, so that inductance, capacity and resistance are all of a distributed character and such magnitude as to insure a Wave development on the coil for the frequencies of the signals desired to receive or transmit,

he were coil is wound with sufiicicnt number of turns so that in a small space is produced the equivalent of a long run tenna in the matter oi" natural electrical periochi a In order that the invention and its mode of operation may be understood by persons skilled in the art, We have in the accoins' panying illustrative drawings and the de. tailed following description, set out one cin bodiment of the same. i

' In these drawings: V Figure l is a diagrammatic-view ing a spiral Wave coil antenna Wher convolutions thereof are arranged inn-"Vere; tical plane, and

Figure2 IS a similar view showing the'- splralevave coil with convolutions arranged in a horizontal, or substantially horizontal plane. 9 .Having more specific reference to""the drawings-fin connect-ion "with which like characters of reference will designate corresponding parts throughout, and having especial reference to Figure 1, We have shown our spiral Wave coil as consisting of a length of electrical conducting material, preferably insulating Wire, indicated by the reference character A, said' length of wire being wound to form a flat spiral resonance wave coil includlng a large number of juxtaposed convolutions, such as clearly shownfl in the Figure 1. A variable contact, indlcated by P, is provided on lead L so that connection. can be made to any desired convolution of coil A, such lead, in-turn, ex-

tending to and having connection with a radio transmitter or receiver, not shown. A second lead, indicated by L is shown con necicd to ground G, the other end of this,

lead going to the radio'transinitter or ra dio receiver, as desired. a As explained in our previous applications referred to above,

the spiral resonance wave coil of-this application, when substituted for the resonance wave, coil of said previous applications, can be used as an efiicient antenna either with or without a ground connection on the transmitting or receiving set.

Referring now to the arrangement of the spiral wave coil, illustrated in the Figure 2,

it will be seen that instead of arrangin the ppnvolutions of said' coil in a vertical p ane, they are here placed in a horizontal, or substantially horizontal plane; the conducting material from which the spiral wave coil is formed being indicated'by the reference character A, while the variable contact therewith is identified by the character P. .As described in connection with the Figure 2, a lead L connecting the conducting Pf extending to one terminal of a radio transmLitter or a radio receiver, not shown. The

opposite, or remaining terminal of the particularradio set upon which the coil is emloyed is connected to ground G, by a lead if desired, although, of course, as hereinbefore stated, the. use of this ground connection L is optional.

- It is also our intention to employ, in some instances, a plurality of these spiral coils, connecting the same in series and connecting the lead,.such as indicated at L, to any v one of the coils as may be desired.

period of the coil approachesthe wave length a In the operation of the spiral wave coil,-

if a ground connection is used, the wave coil and tuning elements'ofthe radio set and ground connection are-all brought into ,tune

with the wave length which-ibis desired to receive or transmit, the wave coil operatin more and more efiiciently as the natura emg utilized for the transmission or reception, only that amountof inducof the spiral coil will vary as the variable contact is moved" along the convolutions tance in eries with the coil and within the' radio transmitter or receiver which may be necessary to obtain the desired couplin within the radio set. The natural perio having responding" to a wide range 0 communication apparatus.

of the coil' the longest wave length being obtained when the contact P is at one en of the coilas indicated in Figures 1 and 2.

In windin the spiral wave'coil we have found that t eturns of the coil should be comparatively closely wound so as to obtain a large inductance within a small diameter. The efficiency ofthe coil for transmitting and receiving increases as the hei ht of the spiral wavecoil about the set is increased;

While the spiral. wave coil in the drawings is shown in only two positions, that-is, one in horizontal and one in a vertical plane the wave coil'can be employed.

Claims: 1. A resonance wave coil comprising a spiral of wire in the form of an open circuit a fixed distributed inductance and capacity of such values that said spiral is capableof having developed thereon a number of standin waves corresponding to a wide ran e of r uencies, means for selecting the element 0 ound, or. istributed it is understood that any desired positionoi the spiral corresponding to the particular frequency .desired, and

waves corfrequencies,

means for selecting the element of the spiral corres riding to the particular frequency desire and means for onnecting said'.se-,

lected'element of said co 1 with radio communication apparatus, said last mentioned means comprising the only. connection between the resonance wave coil and the radio MAUBORGNE. GUY HILL. 

